Here is a pic of one of these boards that a questioner on a FB group posted up
An interesting thing to note is that it appears to be sound capable. At the top right of the board are wiring tabs marked S+ and S-. F7 and F8 tabs on the other side (rear ditch lights etc?). It is also, going by the rivet in the center, made to clip onto Athearn's open frame motor. Someone else said they were now in the latest RTR versions too.
An interesting thing to note is that it appears to be sound capable. At the top right of the board are wiring tabs marked S+ and S-. F7 and F8 tabs on the other side (rear ditch lights etc?). It is also, going by the rivet in the center, made to clip onto Athearn's open frame motor. Someone else said they were now in the latest RTR versions too.